The atomic weights of two elements (A and B) are 20 and 40 respectively. If x % of A contains y atoms, how many atoms are present in 2x g of B?

Explanation

To solve the problem step by step, we can follow these calculations:

### Step 1: Understand the given data
- Atomic weight of element A = 20 g/mol
- Atomic weight of element B = 40 g/mol
- x% of A contains y atoms.

### Step 2: Calculate the number of atoms in x grams of A
...